Fix backend security, validation, and API contracts

docker-compose.dev.yml

@@ -12,8 +12,6 @@ services:
       - "3306:3306"
     volumes:
       - db_data:/var/lib/mysql
-      - ./src/main/resources/schema.sql:/docker-entrypoint-initdb.d/01-schema.sql
-      - ./src/main/resources/data.sql:/docker-entrypoint-initdb.d/02-data.sql
     healthcheck:
       test: ["CMD", "mysql", "-uroot", "-proot", "-e", "SELECT COUNT(*) FROM information_schema.tables WHERE table_schema='Petstoredb' AND table_name='users';"]
       interval: 10s